# Submitted by Mohammad ElKammash

Find the coefficient of $$x^{9}$$ in the expansion of $(2+x)^{10}(1+x)^0+(2+x)^{9}(1+x)+(2+x)^{8}(1+x)^{2}+ \ldots + (2+x)^0(1+x)^{10}.$

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